// Supposes that expression is a symbol expression, i.e. the head is a symbol.
// Returns the definition of this symbol. (Overridden by Symbol.)
Definition *Expression::SymbolDefinition(Calculator *calculator)
{
if(head)
{
Symbol *symbolHead = dynamic_cast<Symbol*>(head);
if(symbolHead)
return symbolHead->GetDefinition(calculator);
}
return 0;
}
